I’m looking for good practicies for WordPress theme development and sales it by themeforest. I would like to ask you, if is possible (by envato rules) to develop WordPress theme which will be full in React.js / Angular.js? There wouldn’t be use functions.php, all calls would be represent with Rest API. Also there wouldn’t be used WordPress routing (with reloading pages). Routing would be developed with front-end technology (Angular or React) too where every change of route would be without page reloading.
Thank you for your replies.